Analysis of Characteristics of a Heavy Rainstorm Process in Nanchang City on July 7,2020  

作　　者：Fengling ZENG Landi ZHONG Minghua MENG 

机构地区：[1]Chongqing Branch,Southwest Air Traffic Management Bureau,Civil Aviation Administration of China,Chongqing 401120,China [2]Nanchang Meteorological Bureau,Nanchang 330038,China

出　　处：《Meteorological and Environmental Research》2024年第1期1-7,11,共8页气象与环境研究（英文版）

基　　金：the Project of Jiangxi Meteorological Bureau"Spatial and Temporal Distribution Characteristics and Classification of Heavy Rainstorm in Nanchang City".

摘　　要：Based on the conventional observation data,dual polarization radar data and NCEP reanalysis data,the large-scale circulation background field,mesoscale conditions and formation causes of a heavy rainstorm in Nanchang on July 7,2020 were studied.It was found that this heavy rainstorm occurred under the weather background of the confrontation between the northward air flow behind the trough and the strong southwest warm and humid air flow to the northwest of the subtropical high.The divergence at the upper level,the shear in the middle and low levels,the southward movement of cold air at the low level,unusually abundant water vapor and high unstable energy caused the heavy rainstorm weather.In this process,under the influence of continuous eastward movement of several strong echo cells,an obvious"train effect"was formed in Nanchang,so that the local rainfall was continuous and intense.Moreover,the average of VIL was about 17 kg/m 2,and its variation characteristics were consistent with the variation trend of 5-min rainfall intensity,which had a certain indicator effect on short-term heavy precipitation.The topography of the Meiling Mountain in the west of Nanchang had a great influence on the formation and precipitation distribution of the heavy rain process.There was a strong rainstorm center near the mountain,and the precipitation was obviously larger than that in the plain area.

关 键 词：Short-term heavy precipitation Mesoscale system Train effect Meiling landform 

分 类 号：P426.62[天文地球—大气科学及气象学]